Hi,
Nicolas Reinecke ported the x201 coreboot code to support the T410s many moons ago (during/after the Prague hackathon). Eventually I came around to test it and it boots fine into Linux with a GRUB2 payload and memtest works fine too. I had to forward port it and add some changes done to similar boards but nothing too complicated. SeaBIOS currently does not boot for unknown reasons and due to missing debug output this will be rather unpleasant to figure out.
One thing I am currently looking at and where I am pretty stuck is ACPI.
At boot Linux prints the following lines: [ 0.222549] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 0.222704] ACPI Exception: AE_NOT_FOUND, Could not execute arguments for [GNVS] (Region) (20150930/nsinit-355) [ 0.222972] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 0.223125] ACPI Error: Method parse/execution failed [_SB._INI] (Node ffff88012f499280), AE_NOT_FOUND (20150930/psparse-542) [ 0.223505] ACPI : EC: EC started [ 0.223608] ACPI: Interpreter enabled [ 0.223683] ACPI: (supports S0 S3 S4 S5) [ 0.223739] ACPI: Using IOAPIC for interrupt routing [ 0.223822] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug [ 0.227171] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 0.227326] ACPI Error: Method parse/execution failed [_SB.PCI0.LPCB.HPET._STA] (Node ffff88012f4ac9d8), AE_NOT_FOUND (20150930/psparse-542) [ 0.227542] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 0.227693] ACPI Error: Method parse/execution failed [_SB.PCI0.LPCB.HPET._STA] (Node ffff88012f4ac9d8), AE_NOT_FOUND (20150930/psparse-542) […] [ 0.247375] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 0.247536] ACPI Error: Method parse/execution failed [_SB.PCI0.LPCB.HPET._STA] (Node ffff88012f4ac9d8), AE_NOT_FOUND (20150930/psparse-542) [ 0.247810] ACPI: PCI Root Bridge [UNCR] (domain 0000 [bus ff]) [ 0.247875] acpi PNP0A03:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI] [ 0.247968] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM […] [ 0.267614] system 00:00: Plug and Play ACPI device, IDs PNP0c02 (active) [ 0.268028] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 0.268183] ACPI Error: Method parse/execution failed [_SB.PCI0.LPCB.HPET._STA] (Node ffff88012f4ac9d8), AE_NOT_FOUND (20150930/psparse-542) […] [ 0.994884] ACPI: Power Button [PWRF] [ 0.995007] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 0.995162] ACPI Error: Method parse/execution failed [_PR.CP00._TPC] (Node ffff88012f4ad5f0), AE_NOT_FOUND (20150930/psparse-542) [ 0.995419] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 0.995610] ACPI Error: Method parse/execution failed [_PR.CP01._TPC] (Node ffff88012f4ad758), AE_NOT_FOUND (20150930/psparse-542) [ 0.995850] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 0.996003] ACPI Error: Method parse/execution failed [_PR.CP02._TPC] (Node ffff88012f4ad8c0), AE_NOT_FOUND (20150930/psparse-542) [ 0.996237] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 0.996390] ACPI Error: Method parse/execution failed [_PR.CP03._TPC] (Node ffff88012f4ada28), AE_NOT_FOUND (20150930/psparse-542) […] [ 1.058181] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 1.058339] ACPI Error: Method parse/execution failed [_PR.CP00._PPC] (Node ffff88012f4ad528), AE_NOT_FOUND (20150930/psparse-542) [ 1.058619] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 1.058773] ACPI Error: Method parse/execution failed [_PR.CP01._PPC] (Node ffff88012f4ad690), AE_NOT_FOUND (20150930/psparse-542) [ 1.059040] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 1.059192] ACPI Error: Method parse/execution failed [_PR.CP02._PPC] (Node ffff88012f4ad7f8), AE_NOT_FOUND (20150930/psparse-542) [ 1.059454] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 1.059617] ACPI Error: Method parse/execution failed [_PR.CP03._PPC] (Node ffff88012f4ad960), AE_NOT_FOUND (20150930/psparse-542)
Also, at suspend from S3 (which worked OK so far), I also get the messages about \PR: [ 239.588752] ACPI: Low-level resume complete [ 239.588798] ACPI : EC: EC started [ 239.588799] PM: Restoring platform NVS memory [ 239.589150] Enabling non-boot CPUs ... [ 239.608626] x86: Booting SMP configuration: [ 239.608627] smpboot: Booting Node 0 Processor 1 APIC 0x1 [ 239.611159] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 239.611168] ACPI Error: Method parse/execution failed [_PR.CP01._PPC] (Node ffff88012f4ad690), AE_NOT_FOUND (20150930/psparse-542) [ 239.611212] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 239.611217] ACPI Error: Method parse/execution failed [_PR.CP01._TPC] (Node ffff88012f4ad758), AE_NOT_FOUND (20150930/psparse-542) [ 239.611250] cache: parent cpu1 should not be sleeping [ 239.611415] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 239.611419] ACPI Error: Method parse/execution failed [_PR.CP01._PPC] (Node ffff88012f4ad690), AE_NOT_FOUND (20150930/psparse-542) [ 239.611440] CPU1 is up [ 239.628643] smpboot: Booting Node 0 Processor 2 APIC 0x4 [ 239.631102] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 239.631109] ACPI Error: Method parse/execution failed [_PR.CP02._PPC] (Node ffff88012f4ad7f8), AE_NOT_FOUND (20150930/psparse-542) [ 239.631159] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 239.631164] ACPI Error: Method parse/execution failed [_PR.CP02._TPC] (Node ffff88012f4ad8c0), AE_NOT_FOUND (20150930/psparse-542) [ 239.631199] cache: parent cpu2 should not be sleeping [ 239.631365] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 239.631369] ACPI Error: Method parse/execution failed [_PR.CP02._PPC] (Node ffff88012f4ad7f8), AE_NOT_FOUND (20150930/psparse-542) [ 239.631390] CPU2 is up [ 239.648678] smpboot: Booting Node 0 Processor 3 APIC 0x5 [ 239.651193] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 239.651201] ACPI Error: Method parse/execution failed [_PR.CP03._PPC] (Node ffff88012f4ad960), AE_NOT_FOUND (20150930/psparse-542) [ 239.651248] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 239.651252] ACPI Error: Method parse/execution failed [_PR.CP03._TPC] (Node ffff88012f4ada28), AE_NOT_FOUND (20150930/psparse-542) [ 239.651285] cache: parent cpu3 should not be sleeping [ 239.651445] ACPI Error: [NVSA] Namespace lookup failure, AE_NOT_FOUND (20150930/psargs-359) [ 239.651449] ACPI Error: Method parse/execution failed [_PR.CP03._PPC] (Node ffff88012f4ad960), AE_NOT_FOUND (20150930/psparse-542) [ 239.651471] CPU3 is up [ 239.653717] ACPI: Waking up from system sleep state S3
I tried to figure at least the latter out but couldn't. AFAICT the port uses cpu/intel/model_206ax/acpi/cpu.asl similar to other board from its era (although it hosts CPUs from the previous model_20656 generation).
Another thing that I would like to add is support for 8 GB DIMMs (and thus 16 GB of total RAM) which I think should theoretically work on this hardware. I have tested an 8 GB DIMM in a W510 (with a Clarksfield i7-820QM CPU and four DIMM slots) with its vendor firmware and it's working fine there. My T410s has an Arrandale i5-520. cpuid and /proc/cpuinfo reports a maximum physical address bits of 0x24 (36) on both systems (indicating a maximum RAM of 64 GB AFAICT). The DIMM in question does not work with the Lenovo firmware in the T410s and fails during memory training with coreboot. Is this futile and simply not supported on this hardware? Why and how to tell?